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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc82a589a26ed234e6fce3ac30712e7eeda6e3ddc1ce1aa095edca685c88496f' 
  AND token = 'PO4lbFKE0De/AKaxIAigyvtmqK+jQVfEZtIeX4I2L88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}